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Teledyne Isco, Inc. Georg Torstveit Who is Teledyne Isco, Inc. ? • 1958 Instrumentation Specialties Company, Nebraska, USA • 1972 Invented the automatic wastewater sampler – Timely for the Clean Water Act (1971) • Today world leader in samplers • Wide range of flow meters • 500 employees Teledyne Isco Manufacturing Teledyne Isco Flow Laboratory Teledyne Isco Flow Laboratory Why Flow Monitoring • No Flow Monitoring – No Control. • Environmental regulations require measurement of quantity (pollutant load), not only quality (concentration). Other uses are: • Water consumption. • Water contribution. • Plant operation and control. • Infiltration and inflow. • Flooding prevention. • Surface runoff. • Sewage overflow. • Rivers and streams. How to measure flow? Isco Open Channel Flow Measurement Handbook Contains tables with Min., Norm., Max. values for various channel configurations Flow Systems Open Channel Flow Measurement To measure flow rate (Q), we need... Q=AxV 1. The pipe or (continuity equation) channel geometry. 3. The 2. The depth average of the flow. velocity of the flow. Open Channel Flow Measurement Methods for measuring flow in open channels: – Timed gravimetric (Stop watch) – Dye Dilution (Color, salt or isotope) – Slope-hydraulic radius (Manning) – Hydraulic structures (Weirs & Flumes) – Area velocity (Doppler, Radar, Electromagnetic) TDI Flow Monitoring Technologies • Level to Flow: – Pressure – Ultrasonic – Bubbler • Area/ Velocity: – Continuous Wave Doppler – Pulsed Doppler • Flowlink data handling software. Manning Formula Presented by Robert Manning in 1889 and recommended for international use in 1936. Hydraulic structures (primary device) - Weirs and Flumes Hydraulic Structure Method (Primary Device) • Most commonly used Flow Measurement Q = A x V, V becomes a constant or linear. technique. • Widely used for permanent applications. • By introducing a structure with known shape and dimension, flow will be related to liquid level. • High degree of accuracy. Side Profile of a Weir Flumes • Converging section • Throat section • Diverging section Parshall Flumes Typical Flow Meter/Monitor Flow Flow Meter Monitor Bubbler An internal air compressor force a metered amount of air through a bubble line submerged in the flow channel. By measuring the pressure needed to force air bubbles out of the line, the level of the water is accurately determined. Typical bubbler installation 4230 Bubbler Flow Meter • IP 65 enclosure. • Stationary/ portable. • 0-3 m measuring range. • 10 days battery capacity (Model 946). • Level, flow rate, rainfall, sample and • 4-20 mA, relay, serial, water quality data. GSM communication. • Printer.
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